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A new car in 2025 will go twice as far on a gallon of gasoline than a 2012 model does now, if automakers comply with new federal standards released today. The U.S. Environmental Protection Agency and the National Highway Traffic Safety Administration announced aggressive new rules to raise the fuel efficiency of cars, SUVs and pickup trucks

To help prevent pedestrian accidents, otherwise silent electric cars must emit a noise while they drive. What noise

[Sound clip] That's the future sound filling city streets.